Multicylinder two-stroke motor



M. A. VIOLET.

MULTICYLINDER TWO-STROKE MOTOR.

APPLICATION FILED-NOV. 21. 1917.

1 346 069. Patented ly 6, 1920.

2 SHEETS-SHEET 1.

M. A. VIOLET.

MULTICYLINDER TWO-STROKE MOTOR. APPLICATION FILED NOV. 21, 1917. 1,34 ,069. Pmntea July 6,1920,

2 SHEETS-SHEET 2.

15 part of this 45 round bar, without forging.

o rT-Eo s A'rEs PATENT OFFICE.

molar. AonILLnvmLEr, or LEVALLOIS-PERRET, FRANCE.

Seine, in the said republic, have invente certain new and useful Improvements in Multli linder T wo-Stroke Motors; and I do hereby declare the following to be a full, clear,--and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to theaccompanying drawings," and to letters orfigures of reference marked thereon, which form a ecification.

The invention relates to a: multi-cylinder two stroke motor which to the advantages of perfect operation and efficiency adds that of a very economical construction, by reason of the restricted number of parts, of

which it is composed. This motor is illustrated in a longitudinal view, one half in elevation, one half in 'section, in Figure 1 of the accompanying drawing. 1 I

Fig. 2 is a transverse view thereof,'part1y in section. f Fig. 3 is a detail view showing the lubrieating rooves formed in the upper face of the casing. L.

a detached view, in longitudinal\ elevation, of the. crank shaft, of which Rig. pletely cut off the entrance to this 5 isan end view.

As an example a group of four cylinders has been represented, but it will be readily understood that the number of cylinders Fig. 4 is may be varied.

The crank shaft a. provided with crank pins a a, a a, equal in number to that of 40 the cylinders and carried by disksib, b, b b ,etc., provided with central bearings 0 c c ,;between the crank pins. In'practice it. is advantageous, especially for'small motors, to form the crank shaft from a The crank shaft a rotates in a casing d divided by partitions e, and the. gases cannot circulatefrom one compartment to the other. Further, the volume of each compartment as near as possible ap roximates that of the volume generated by t e parts in motion, so as to reduce to a minimum the o, as shown in the drawing.

ter for the purpose of lightening the whole.

, The upper face d of the casing is pierced MULrIcYLInnEn rwo-s'rneKE MOTOR.

Specification of Letters Patent.

Patented July 6,1920.

:Application filedNovember 21, 1917. Serial No. 203,195.

withorifices a just suflicientto allow the passage of the connecting rods Z.

The same upper face al is hollowed with grooves fof crescent form 1 and 3) intended to collect the oil drawn up by the pistons and whence this oil proceeds by passa es 9 to the crank shaft bearings.

he lubrication of the motor is effected by drop regulators on the admission or, preferably, by the incorporation of oil; with the motor spirit in sultable proportions. The

oil accumulates subsequently at the bottom of the compartments of the casing and it is picked up by the connecting rod heads which it lubricates.

The cylinders h, which form one each bears an admission port 2', placed in communication with the carbureter, and an exhaust port j, communicating with the silencer or with the atmosphere. Further, each cylinder is provided with a pocket is, of suitable volume, having for its object to allow the gases which are situated beneath the piston when this is at, the bottom a of its downward stroke to pass into the ex plosion chamber. r Inturn, the pistons m are pierced with an opening 12. which places the pocket 70 of the cylinder in communication with the space beneath the piston after the latter, in de scending, has by its cylindrical part comocket. The pockets la in the wall of the cy inders and the openings n pierced through the pistons have for their object to as far as possi- 'ble shorten the path traveled by the'gases' before theirentrance to the explosion chamher. This arrangement, contrary to that which ordinarily exists, prevents their passage through the casing, which passage is 'here'rendered ditiicult by the rapid rota- "tion 'of the crankshaft and the connecting rods, which constitute a real blower, and it does awa. with the brake action of these gases in t e conduit by whichthey habitublock,

ally ascendfrom the casing to the explosion chambers The sup ression of; this circuit has also a beneficia effecton the carbura-v tion, the gases bein no longer impoverished in s i-rit to the detriment of the oil contained in t e casing.

The pistons are proyided with a deflector For ignition of-this motor, the usual arrangements (a ma eto rotating at twice the speed of motor may be employed, or,

preferably the arrangement described in the specification of my prior application for Patent No. 176,127, filed, June 21st, 1917.

. crank casing, partitions dividing the casing into compartments, a crank shaft extending through the compartments with a crankin each compartment, a cover for each compartmeiit having a piston rod opening, oil collecting grooves formed in the upper faces of the cover beneath the lower end of the piston, oil ducts extending from said grooves to the shaft-bearings and means to vent gases from each compartment through the piston rod opening and the interior of the piston into the explosion chamber;

aeeaoee 21A multi-cylinder two stroke motor,

comprising a crank casing, a plurality of partitions dividing the casing into a series of compartments, a crank shaft extending through the compartments having bearing portions journaled in the partitions, anda pair of crank disks between each bearing working in each compartment, a piston rod connected With each pair of crank disks, a cover for each compartment having an opening for the passage of the piston rods, arcuate oil-collecting grooves formed in the upper faces of the covers, and oil conduits extending through the partitions connecting the grooves with the shaft bearings.

In testimony that I claim the foregoing as my invention I have signed my name in presence of two subscribin witnesses.

MARCEL ACHI LE VIOLET.

Witnesses: v

' CHAS. P. PREssLY,

CHARLES ASH, 

